ISO 21940-14:2012

Name: ISO 21940-14:2012 — Mechanical vibration — Rotor balancing — Part 14: Procedures for assessing balance errors
SKU: ISO 21940-14:2012
Price: 27000 RUB
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Mechanical vibration — Rotor balancing — Part 14: Procedures for assessing balance errors

Название (английский):

ISO 21940-14:2012

Mechanical vibration — Rotor balancing — Part 14: Procedures for assessing balance errors

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 15
Дата публикации:: 21 июня 2012 г.
Издание:: ISO IS 21940 edition 1 version 1
ICS:: 21.120.40

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Цена:27 000 ₽

Описание (английский):

This part of ISO 21940 specifies the requirements for the following: a) identifying errors in the unbalance measuring process of a rotor; b) assessing the identified errors; c) taking the errors into account. This part of ISO 21940 specifies balance acceptance criteria, in terms of residual unbalance, for both directly after balancing and for a subsequent check of the balance quality by the user. For the main typical errors, this part of ISO 21940 lists methods for their reduction in an informative annex.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 21940-14:2012 - "Mechanical vibration - Rotor balancing - Part 14: Procedures for assessing balance errors" defines procedures to identify, assess and account for errors in rotor unbalance measurements. It specifies balance acceptance criteria (residual unbalance) for both immediate results after balancing and for later user checks. The standard explains error sources and gives methods to reduce them (informative annex), extending earlier guidance (ISO 1940-2) to rotors with flexible behaviour.

Key topics and requirements

Error classification: systematic errors, randomly variable errors, and scalar errors - each treated differently when assessing measurement uncertainty.

Identification of error sources: examples include runout, mandrel/shaft eccentricity, bearing runout, tooling fit, residual magnetism, loose parts, thermal or windage effects, and assembly clearances.

Error assessment methods:

Experimental procedures to estimate random errors (multiple runs, vector plots, mean vector and enclosing circle to estimate maximum single-run error).
Evaluation of systematic errors by calculation or measurement; where possible these should be eliminated, corrected, or quantified.
Treatment of scalar errors where angle is indeterminate but magnitude can be bounded.

Balance acceptance criteria: residual unbalance limits to determine if balancing operation met required quality - criteria apply both directly after balancing and for subsequent verification by the user.

Reporting: measured unbalance before and after correction must be recorded if errors are taken into account by calculation.

Reduction guidance: informative annex lists practical methods to reduce typical errors.

Practical applications and users

Balancing machine manufacturers - to design equipment with minimized systematic errors and to specify performance.

Rotordynamics and vibration engineers - to assess measurement uncertainty and validate balancing results.

Maintenance and overhaul teams - to verify that in-shop or in-situ balancing meets acceptance limits.

Quality assurance and test laboratories - to document balance test procedures, acceptance, and uncertainty. Practical uses include developing balancing procedures, troubleshooting measurement discrepancies, setting reporting protocols, and improving product and process tolerances to reduce unbalance.

Related standards

ISO 1925 (Vocabulary)

ISO 1940-1 (Balance quality requirements for rigid rotors)

ISO 11342 (Balancing flexible rotors)

ISO 21940-21 (Description and evaluation of balancing machines)

Keywords: ISO 21940-14:2012, rotor balancing, mechanical vibration, balance errors, residual unbalance, balancing machine, systematic errors, randomly variable errors, scalar errors.

ISO 21940-14:2012

Abstract

Похожие стандарты

Overview

Key topics and requirements

Practical applications and users

Related standards

Технические детали

ISO 1940-2:1997

Mechanical vibration — Balance quality requirements of rigid rotors — Part 2: Balance errors

BS EN ISO 19250:2013

Water quality. Detection of Salmonella spp..

BS ISO 1940-1:2003

Mechanical vibration. Balance quality requirements for rotors in a constant (rigid) state - Specification and…

ISO 11342:1998

Mechanical vibration — Methods and criteria for the mechanical balancing of flexible rotors

BS ISO 21940-21:2012

Mechanical vibration. Rotor balancing - Description and evaluation of balancing machines